2809161663980 has 48 divisors (see below), whose sum is σ = 6743143814400. Its totient is φ = 962976024768.

The previous prime is 2809161663961. The next prime is 2809161664013. The reversal of 2809161663980 is 893661619082.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 899030 + ... + 2535069.

It is an arithmetic number, because the mean of its divisors is an integer number (140482162800).

Almost surely, 2^{2809161663980} is an apocalyptic number.

2809161663980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2809161663980 is an abundant number, since it is smaller than the sum of its proper divisors (3933982150420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2809161663980 is a wasteful number, since it uses less digits than its factorization.

2809161663980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3439958 (or 3439956 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 59.

The spelling of 2809161663980 in words is "two trillion, eight hundred nine billion, one hundred sixty-one million, six hundred sixty-three thousand, nine hundred eighty".